Re: thermoquad VS. Holley 750 DP
[Re: Mr.Yuck]
#1031744
07/16/11 08:26 AM
07/16/11 08:26 AM
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Joined: Jun 2008
Posts: 10,847 Oakdale CT
gdonovan
I Live Here
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I Live Here
Joined: Jun 2008
Posts: 10,847
Oakdale CT
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Quote:
"TQ is going to give you way better mileage around town."
how's that? the engine is going to pull the needed fuel amount reguardless of carb.
Ever drive your car around with an O2 meter and a vacuum gauge?
Ran both a TQ and a Holley on my GTX, the Holley was atrocious when it came to transitions from circuit to circuit. Spent over a month trying to get the Holley to work as well as the TQ, it just could not do it due to the design.
Holleys really do cover flaws in their design with "more fuel" at least the one I was working on did.
For a race application I would not have a problem with either a TQ or Holley but for the street I'd run nothing but a TQ IMHO.
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Re: thermoquad VS. Holley 750 DP
[Re: Mcode69]
#1031745
07/16/11 10:21 AM
07/16/11 10:21 AM
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Joined: Jan 2003
Posts: 24,562 Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Quote:
The TQ takes a lot to tune and is absolutly no comparison to a DP Holley. I tried to run a TQ and succeeded but in the end the Holley won out hands down in Performance. When you are talking tenth's of a second I will now stick with Holley. PS in mileage try a Q jet easy to tune and reliable and with Chrysler linkage from 1985 up to 1988
If the holley won hands down in performance it means your TQ was WAY out of tune. I've had a 750DP and a TQ on the same engine and the difference was 11 mpg from the holley and 17 from the TQ around town. Never saw any track times but the TQ had the holley by the butt dyno. And apart from that [and here's a name from the past] Ed Hamburger insisted that a TQ will have 2 tenths over a similar sized double pumper all day. As someone stated previously holley tend to cover up deficiencies in their design by making it rich, they CANNOT meter fuel properly at part throttle apart from all their other problems.
Then the holley was way out of tune. No way the TQ is going to get 6mpg better. And the TQ was probablt a 1050 vs a 750 at the track...
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Re: thermoquad VS. Holley 750 DP
[Re: Mr.Yuck]
#1031747
07/16/11 12:20 PM
07/16/11 12:20 PM
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Joined: Nov 2009
Posts: 2,275 Desert Tracker
HYPER8oSoNic
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,275
Desert Tracker
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Quote:
I doubt you will see much differnce in MPG w/ a TQ. Unless your DP is way out of tune. Plus factor in you'll have to pay somebody to set it up then you have to figure how many miles you have to drive to make up any savings. Kind of like the fools that got rid of their paid for 20-22mpg cars to by a hybrid that gets 40's. How far would one need to drive to start saving money?
Mr. Y, at the strip, HOLLEYS are the NORM. Unless, you have a mild combo, in a LIGHT vehicle the DP suffers from some mileage penalty. And you need to run a SMALLER one (650) at that. WHO would want better mileage out of a mega-displacement motor anyway! The beauty of the TQ, is that besides it's generous airflow ratings, it's VERY tunable!! AND it can be bolted on (provided you have a TQ flanged intake) on ANY MOPAR motor (except the 6's, and as we speak someone will make manifolds for them TOO, eventually) and still perform WELL!! Great for the street and a SHOCKER on the STRIP!! Oh, did I forget to mention, it DOES get BETTER MILEAGE than the DP!! So does the 6 pack !!
"Stupidity is Ignorance on Steroids" "Yeah, it's hopped to over 160" (quote by Kowalski in the movie Vanishing Point 1970 - Cupid Productions)
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Re: thermoquad VS. Holley 750 DP
[Re: HYPER8oSoNic]
#1031749
07/16/11 02:31 PM
07/16/11 02:31 PM
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Joined: Jan 2003
Posts: 28,067 Irving, TX
feets
Senior Management
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Senior Management
Joined: Jan 2003
Posts: 28,067
Irving, TX
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It seems that many of you are forgetting that you don't drive on the street at exactly ONE throttle position.
Given one throttle position and one engine load you can make any carb perform great. Now, when you get into the on/off throttle application, hills, different engine loads due to added weight in the vehicle, and the billions of other real world situations the design of the TQ will be able to give you better economy than a Holley DP. Think about that Holley for a second. Move the throttle and it opens primary and secondary bores with both accelerator pumps dumping fuel. The TQ opens the primaries and if the draw is strong enough it will begin opening the secondaries and back off as the load is eased. The pump will shoot fuel but not to the degree of the Holley.
On a drag strip or race car the Holley will be hard to beat. The TQ could hold it's own but that would require an expert's touch.
When I was playing with carbs I could normally get the best performance (butt dyno) out of a Holley. However, once tuned to performance the Holley was way behind the AFB and TQ when it came to street manners. Since my cars are street cars I did not run Holley carbs for long.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind. - Stu Harmon
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Re: thermoquad VS. Holley 750 DP
[Re: goldmember]
#1031751
07/16/11 03:34 PM
07/16/11 03:34 PM
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Joined: Sep 2003
Posts: 1,465 Carson City, NV
babarracuda
OP
pro stock
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OP
pro stock
Joined: Sep 2003
Posts: 1,465
Carson City, NV
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I know several guys with TQ on their 360's that run SS. None of these guys thinks a 750DP will perform like a TQ. I realy don't care if a DP is faster at the races, I want to drive to see my cousin and old racing buddies at Famoso, San Luis Obispo and Simi Valley, CA. Some of the rants must be made without the brain in gear. A 1 3/8 primary VS. a 1 11/16 cannot pass the same amount of fuel. A small hole has better velosity than a large hole. These are not my ideas, just scientific facts. Why doesn't a Holley DP get the same mileage as an Edelbrock 750. Could it be metering rods instead of power valve? If you read my first post, I said I was going to have the carb setup, not screw it up with my lack of Thermoquad knowledge. A friends omnce toild me that the really smart man doesn't know everything, he just knows where to get HELP!!!
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Re: thermoquad VS. Holley 750 DP
[Re: feets]
#1031752
07/16/11 03:36 PM
07/16/11 03:36 PM
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Joined: Jan 2003
Posts: 9,826 las vegas
70AARcuda
master
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master
Joined: Jan 2003
Posts: 9,826
las vegas
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[quoteThink about that Holley for a second. Move the throttle and it opens primary and secondary bores with both accelerator pumps dumping fuel. The TQ opens the primaries and if the draw is strong enough it will begin opening the secondaries and back off as the load is eased. The pump will shoot fuel but not to the degree of the Holley. When I was playing with carbs I could normally get the best performance (butt dyno) out of a Holley. However, once tuned to performance the Holley was way behind the AFB and TQ when it came to street manners. Since my cars are street cars I did not run Holley carbs for long.
Not true on a holley dp...the secondary throttle blades and acelerator pump do not begin to open until the primaries open 40 degrees...
Tony
70 AARCuda Vitamin C 71 Dart Swinger 360 10.318 @ 128.22(10-04-14 Bakersfield) 71 Demon 360 10.666 @122.41 (01-29-17 @ Las Vegas) 71 Duster 408 (10.29 @ 127.86 3/16/19 Las Vegas)
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Re: thermoquad VS. Holley 750 DP
[Re: feets]
#1031757
07/16/11 09:30 PM
07/16/11 09:30 PM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
The TQ opens the primaries and if the draw is strong enough it will begin opening the secondaries and back off as the load is eased. The pump will shoot fuel but not to the degree of the Holley.
Not true, The secondaries will not start (be able) to open untill at least 40% throttle. Same with a QJ.
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Re: thermoquad VS. Holley 750 DP
[Re: HYPER8oSoNic]
#1031761
07/17/11 02:37 AM
07/17/11 02:37 AM
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Joined: Feb 2005
Posts: 5,221 Branson, Mo.
joedust451
super gas
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super gas
Joined: Feb 2005
Posts: 5,221
Branson, Mo.
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Quote:
Quote:
Quote:
The TQ opens the primaries and if the draw is strong enough it will begin opening the secondaries and back off as the load is eased. The pump will shoot fuel but not to the degree of the Holley.
Not true, The secondaries will not start (be able) to open untill at least 40% throttle. Same with a QJ.
To a point. The air door IS adjustable! When you have smaller, efficient, double venturi primaries working for you, there is a LOT of high velocity AIRFLOW going into the motor, more so than a Holley. Makes for a BETTER burn in the cylinders. The bigger secondary bores provide additional air/fuel flow to the already higher velocity primary jet stream. More torque!!
Not talking about the air door, alot of what your saying has nothing to do with what i said , not trying too be a jerk, just saying.
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Re: thermoquad VS. Holley 750 DP
[Re: joedust451]
#1031762
07/17/11 02:58 AM
07/17/11 02:58 AM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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if the thermoquad is really so much better than a holley carb in fuel economy for the daily driver and also performance on the track, what would the reason be that so many people prefer something other than a thermoquad? surely there must be a reason that 99% of people choose something else isn't there? can that many people be wrong?
machine shop owner and engine builder
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Re: thermoquad VS. Holley 750 DP
[Re: Performance Only]
#1031763
07/17/11 03:22 AM
07/17/11 03:22 AM
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Joined: Apr 2011
Posts: 450 owensboro, ky
rallye73
mopar
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mopar
Joined: Apr 2011
Posts: 450
owensboro, ky
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Quote:
if the thermoquad is really so much better than a holley carb in fuel economy for the daily driver and also performance on the track, what would the reason be that so many people prefer something other than a thermoquad? surely there must be a reason that 99% of people choose something else isn't there? can that many people be wrong?
Probably the same reason why Chevy guys think a small belongs in everything...because it is all they know. Most people don't wanna take the time to set the carb up right. So when it doesn't perform the way they thought it would they just ditch it for the Holley. Same with the QJ. People complain about the bog in those too, but you can tune it out of them also. Only thing with the QJ is they never made as large of a cfm as the thermoquad. 800 was the biggest they had.
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